2007 grand marquis i have no heat only blows cold air
Does your temp gauge bonce around or stay flat to one point of the scale as well when you try to run the heater?
No/ Now I am getting hot air when the air condition is on. but this only happens once and while?
Hmmm could be a sensor in the AC unit control. Also if havn't checked the AC coolant you may have a need to have it serviced an recharged.
Looking for a Used Grand Marquis in your area?
CarGurus has 1,740 nationwide Grand Marquis listings starting at $1,800.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts